Minimizing median difference quantization error for image compression

Taujuddin, Nik Shahidah Afifi and Ibrahim, Rosziati and Sari, Suhaila (2016) Minimizing median difference quantization error for image compression. In: International Conference on ICT Convergence 2016, 19-21 October 2016, Jeju Island, South Korea.

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Abstract

This research emphasis on problem of quantization process in transform-based image compression. In specifying the quantizer, the size of interval is giving huge impact to the quantization performance. Generally, high quantization error will occurred if large interval is used at high difference value bin. Thus, quantizer needs to be design carefully to outfit the value as efficient as possible to reduce the quantization error. Contrary to the traditional approach, that apply uniform or non-uniform quantization step size, the proposed one utilize the high occurrence of zero coefficient by re-allocate the non-zero coefficient in a group for quantization. Then the proposed coder employ quantization error minimization mechanism by calculating the difference median quantization error at each quantization interval class. The results are then compared to the standard transform based algorithm and we found that the proposed algorithm compress the image effectively without harming the quality of the compressed image.

Item Type:Conference or Workshop Item (Paper)
Uncontrolled Keywords:quantization; median error difference, wavelet coefficients
Subjects:Q Science > Q Science (General)
Divisions:Faculty of Electrical and Electronic Engineering > Department of Computer Engineering
ID Code:8525
Deposited By:Mrs. Nik Shahidah Afifi Md Taujuddin
Deposited On:09 Nov 2016 11:55
Last Modified:09 Nov 2016 11:55

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